Thanks for the explanation.You are correct the ethmoid sinuses are present at birth but these sinuses do not usually become infected in babies. The maxillary sinuses are tiny buds on either side of the nose in babies of 12 months and are unlikely to become infected at this age.The frontal sinuses usually appear by the age of 7 years.
Please give your baby a good probiotic now after his recent antibiotic treatment.
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